REVIEW OF THE GRANITES BY STATES 379 



Maine. — Biotite-granites are especially prominent in Maine, and the 

 figures above given are the more significant because the data are more 

 complete than are those of many of the other states. The quarries in 

 the interior are less developed than are those on the seacoast, and it 

 may be that hornblendic varieties are relatively more abundant away 

 from the ocean. The one hornblende-granite cited in the table occurs 

 at Otter creek, Mount Desert, "and, as remarked by G. P. Merrill,* it re- 

 sembles the red Saint George's hornblende-granite of New Brunswick. 

 The two biotite-hornblende granites of the table are both from Saint 

 George, Knox county. In the southern central part of the state. Doctor 

 Merrill f has already remarked the prevalence of the biotite-granites over 

 all other varieties in Maine. 



There is a very considerable literature on the coastal region of Maine, 

 but the petrographical characters of the granites are not often referred 

 to in detail. G. 0. Smith, in his valuable paper on the " Geology of the 

 Fox Islands,'' 1896, p. 60, gives some observations on the rock at Vinal 

 Haven. 



New Hampshire. — In the granites of this state muscovite is a frequent 

 associate of biotite, the two micas appearing together about as often as 

 does biotite alone. One hornblendic variety is known at the famous 

 intrusion on Mount Willard, in the Crawford notch, a locality that has 

 been made classic by the work of Hawes.ij: Four or five others are men- 

 tioned by Hawes in the New Hampshire report, and about as many 

 more with both biotite and hornblende. 



Vermont. — In Vermont the same general relations hold good as in the 

 states just noted. Biotite-granites are now known to occur on Mount 

 Ascutney in association with very acidic augite-syenites of peculiar 

 and rather complex mineralogy. § 



Massachusetts. — Hornblende-granites are relatively more prominent in 

 Massachusetts than in any other state of the Atlantic border, because of 

 the peculiar petrographic characters of the rocks to the north and south 

 of Boston. The Quincy hornblende-granite is one of our best known 

 building stones, but its detailed microscopic characters have not received 

 much attention until recently. The presence of the soda-amphibole 

 riebeckite, as finally determined by H. S. Washington, distinguishes 

 it from the ordinary run of granites and suggests connections with 



*G. p. Merrill : On the collection of Maine building stones in the U. S. National Museum. U. S. 

 Nat. Mus. Proceedings, vol. vi, 1883, pp. 178-183. 



tG. P. Merrill : Stones for building and decoration, second edition, pp. 236-2'15. 



X G. W. Hawes : The Albany granite and its contact-phenomena. Amer. Jour. Sci., Jan., 1881, p. 

 21. Report on the lithology of New Hampshire. N. H. Geol. Survey, vol. iii, 1878, p. 190. 



g The Ascutney rocks are now under investigation by R. A. Daly. Several analyses have been 

 published (Bull. 148, U. S. Geol. Survey, pp. 68-69), and Mr Daly gave verbally some details of the 

 rocljs in the discussion of Professor Cushing's paper, which appears elsewhere in this volume. 



